RCA Cunningham Number / Type 85 #85 Engraved / Stamped Base Vacuum Tube Valve NOS-Testing Handel May 18 2020 This hardcover book is in

This hardcover book is in fair condition

not included) in one of my RC-2 monoblocks with Fleetwood Macs' "Tusk" and they sound great

but will work fine in virtually all applications

Transconductance measured 50/52 for Tube One and 53/52 for Tube Two where minimum (65%) is 25/25 and 100% is 39/39

Transconductance measured 41/42 where minimum (65%) is 21

RCA Cunningham Number / Type 85 #85 Engraved / Stamped Base Vacuum Tube Valve NOS-Testing Handel May 18 2020 This hardcover book is inThis new old stock testing RCA Cunningham engraved base type 85 tube was tested on our Paul Hart calibrated TV7 U for shorts, gas, emissions and transconductance. There were no shorts or gas. It measured 45 in its triode section where minimum (65%) is 25 and 100% is 39. The diodes measured 56 and 56, respectively, where minimum (65%) is 40 40 and 100% is 61 61. IN 2021 WE PURCHASED 150,000 VACUUM TUBES. IF IT'S NOT LISTED, WE PROBABLY HAVE IT. PLEASE